new: [rsync-backup-target] new charm.

rsync-backup-target/build/Dockerfile

@@ -0,0 +1,31 @@
+FROM debian:jessie
+
+MAINTAINER Valentin Lab <valentin.lab@kalysto.org>
+
+RUN apt-get update && \
+    DEBIAN_FRONTEND=noninteractive apt-get install --force-yes -y --no-install-recommends openssh-server sudo rsync && \
+    apt-get clean && \
+    rm -rf /var/lib/apt/lists/*
+
+
+COPY ./src/usr/local/sbin/* /usr/local/sbin/ 
+
+## New user/group rsync/rsync with home dir in /var/lib/rsync
+RUN mkdir -p /var/lib/rsync && \
+    groupadd -r rsync && \
+    useradd -r rsync -d /var/lib/rsync -g rsync && \
+    chown rsync:rsync /var/lib/rsync
+
+
+## Allow rsync to access /var/mirror
+COPY /src/etc/sudoers.d/rsync /etc/sudoers.d/rsync
+
+RUN chmod 440 /etc/sudoers.d/*
+
+RUN mkdir /var/run/sshd
+
+COPY ./entrypoint.sh /entrypoint.sh
+
+EXPOSE 22
+
+ENTRYPOINT [ "/entrypoint.sh" ]

rsync-backup-target/build/entrypoint.sh

@@ -0,0 +1,23 @@
+#!/bin/bash
+
+
+##
+## code
+##
+
+chmod 440 /etc/sudoers.d/* -R
+
+KEYS=/etc/rsync/keys/
+RSYNC_HOME=/var/lib/rsync
+
+mkdir -p "$RSYNC_HOME/.ssh"
+
+for f in "$KEYS"/*; do
+    [ -e "$f" ] || continue
+    content=$(cat "$f")
+    echo "command=\"/usr/local/sbin/ssh-cmd-validate\" $content"
+done > "$RSYNC_HOME"/.ssh/authorized_keys
+chown rsync:rsync -R "$RSYNC_HOME"/.ssh -R
+
+## Give back PID 1 so that ssh can receive signals
+exec /usr/sbin/sshd -D

rsync-backup-target/build/src/etc/sudoers.d/rsync

@@ -0,0 +1,10 @@
+## allow rsync to access /var/mirror
+
+rsync ALL=(root) NOPASSWD: /usr/bin/rsync --server -vlogDtprRz --delete . /var/mirror/*
+rsync ALL=(root) NOPASSWD: /usr/bin/rsync --server -vlogDtprRze.iLs --delete . /var/mirror/*
+rsync ALL=(root) NOPASSWD: /usr/bin/rsync --server -vlogDtprRze.iLsf --delete . /var/mirror/*
+rsync ALL=(root) NOPASSWD: /usr/bin/rsync --server -vlogDtprRze.iLsf --bwlimit=200 --delete . /var/mirror/*
+rsync ALL=(root) NOPASSWD: /usr/bin/rsync --server -vlogDtpArRze.iLsf --delete . /var/mirror/*
+rsync ALL=(root) NOPASSWD: /usr/bin/rsync --server -vlogDtpArRze.iLsf --bwlimit=200 --delete . /var/mirror/*
+rsync ALL=(root) NOPASSWD: /usr/bin/rsync --server -vlogDtpArRze.iLsfx --delete --partial-dir .rsync-partial --numeric-ids . /var/mirror/*
+rsync ALL=(root) NOPASSWD: /usr/bin/rsync --server -vlogDtpArze.iLsfx --delete --partial-dir .rsync-partial --numeric-ids . /var/mirror/*

rsync-backup-target/build/src/usr/local/sbin/ssh-cmd-validate

@@ -0,0 +1,22 @@
+#!/bin/sh
+
+exname=$(basename "$0")
+
+reject() {
+    logger -t "$exname" "REJECTED: $SSH_ORIGINAL_COMMAND"
+    echo "Your command has been rejected and reported to sys admin."
+}
+
+case "$SSH_ORIGINAL_COMMAND" in
+    *\&* | *\(* | *\{* | *\;* | *\<* | *\`*)
+        reject
+        ;;
+    md5sum\ /var/mirror/*|find\ /var/mirror/*|rsync\ --server*)
+	    echo "ACCEPTED: $SSH_ORIGINAL_COMMAND" >/tmp/accepted
+	    logger -t "$exname" "ACCEPTED: $SSH_ORIGINAL_COMMAND"
+	    sudo $SSH_ORIGINAL_COMMAND
+	    ;;
+    *)
+	    reject
+	    ;;
+esac

rsync-backup-target/hooks/init

@@ -0,0 +1,40 @@
+#!/bin/bash
+
+## Init is run on host
+## For now it is run every time the script is launched, but
+## it should be launched only once after build.
+
+## Accessible variables are:
+## - SERVICE_NAME        Name of current service
+## - DOCKER_BASE_IMAGE   Base image from which this service might be built if any
+## - SERVICE_DATASTORE           Location on host of the DATASTORE of this service
+## - SERVICE_CONFIGSTORE         Location on host of the CONFIGSTORE of this service
+
+
+set -e
+
+service_def=$(get_compose_service_def "$SERVICE_NAME")
+
+keys=$(echo "$service_def" | shyaml get-value options.keys 2>/dev/null) || true
+
+[ "$keys" ] || exit 0
+
+local_path_key=/etc/rsync/keys
+host_path_key="$SERVICE_CONFIGSTORE${local_path_key}"
+key_nb=0
+
+volume_keys=()
+while read-0 key; do
+    debug "Creating access key ${key_nb}" || true
+    echo "$key" | file_put "$host_path_key/key_${key_nb}.pub"
+    ((key_nb++)) || true
+done < <(echo "$keys" | shyaml get-values-0)
+
+volume_keys+=("$host_path_key:$local_path_key:ro")
+
+init-config-add "\
+$SERVICE_NAME:
+  volumes:
+    - $host_path_key:$local_path_key:ro
+"
+

rsync-backup-target/metadata.yml

@@ -0,0 +1,3 @@
+description: Backup Rsync over SSH Target
+data-resources:
+  - /var/mirror